Surgical clip applier

ABSTRACT

A surgical clip applier is provided including a housing; at least one handle pivotably connected to the housing; a channel assembly extending distally from the housing; a plurality of clips loaded in the clip carrier; a drive channel translatably supported in the housing and the channel assembly, the drive channel being translated upon actuation of the at least one handle; and a counter mechanism supported in the housing, the counter mechanism including indicia visible through the housing, wherein the indicia corresponds to a quantity of clips loaded in the clip applier, wherein the indicia decrements upon each firing of the clip applier resulting in a reduction in the quantity of clips remaining of the plurality of clips.

CROSS REFERENCE TO RELATED APPLICATION

This application is a continuation application claiming the benefit of and priority to U.S. patent application Ser. No. 14/882,535, filed on Oct. 14, 2015, which is a continuation application claiming the benefit of and priority to U.S. patent application Ser. No. 12/939,296, filed Nov. 4, 2010 (now U.S. Pat. No. 9,186,136), which claims the benefit of and priority to U.S. Provisional Application Ser. No. 61/285,006, filed on Dec. 9, 2009, the entire content of each of which being incorporate herein by reference.

BACKGROUND 1. Technical Field

The present application relates to surgical instruments, and more particularly, to surgical clip appliers having a plurality of clips for applying the clips to body tissues and vessels during surgical procedures.

2. Discussion of Related Art

Surgical clip appliers are known in the art and have increased in popularity among surgeons by offering an alternative to conventional suturing of body tissues and vessels. Typical instruments are disclosed in U.S. Pat. No. 5,030,226 to Green et al. and U.S. Pat. No. 5,431,668 to Burbank, III et al. These instruments generally provide a plurality of clips which are stored in the instrument and which are fed sequentially to the jaw mechanism at the distal end of the instrument upon opening and closing of the handles at the proximal end of the instrument. As the handles are closed, the jaws close to deform a clip positioned between the jaw members, and as the jaws are opened to release the deformed clip, a new clip is fed from the series to a position between the jaws. This process is repeated until all the clips in the series of clips have been used.

A need exists for a user of the clip applier to know how many clips remain in the clip applier and/or to know when a final clip of the plurality of clips has been fired.

SUMMARY

The present application relates to surgical clip appliers having a plurality of clips for applying the clips to body tissues and vessels during surgical procedures and their methods of use.

According to an aspect of the present disclosure, a surgical clip applier is provided including a housing; at least one handle pivotably connected to the housing; a channel assembly extending distally from the housing; a plurality of clips loaded in the clip carrier; a drive channel translatably supported in the housing and the channel assembly, the drive channel being translated upon actuation of the at least one handle; and a counter mechanism supported in the housing, the counter mechanism including indicia visible through the housing, wherein the indicia corresponds to a quantity of clips loaded in the clip applier, wherein the indicia decrements upon each firing of the clip applier resulting in a reduction in the quantity of clips remaining of the plurality of clips.

The counter mechanism may be rotatably supported in the housing and may include a uni-directional clutch member permitting rotation of the counter mechanism in a single direction. The counter mechanism may include a counter dial rotatably supported in the housing, wherein the counter dial includes the indicia thereof; and a counter clutch operatively connected to the counter dial such that rotation of the counter clutch in a first direction results in rotation of the counter dial in the first direction, and rotation of the counter clutch in second direction results in no rotation of the counter dial.

The counter mechanism may include a latch member operatively engaged with the counter dial. In use, the latch member permits rotation of the counter dial in the first direction and inhibits rotation of the counter mechanism in a direction opposite to the first direction.

The counter dial may include a plurality of grooves formed in an outer periphery thereof, and the latch member may include a resilient finger biased into engagement with the plurality of grooves of the counter dial.

The counter clutch may be concentrically, rotatably nested in a bore defined in the counter dial. The counter clutch may include at least one resilient finger extending therefrom for engagement with uni-directional teeth formed in a perimetrical surface of the bore of the counter dial.

The drive channel may define an angled slot therein, and the counter clutch may include a clutch pin extending from a surface thereof and may be slidably disposed in the angled slot of the drive channel. In use, translation of the drive channel in a first direction relative to the counter mechanism would cause the clutch pin to be cammed by the angled slot thereof thereby causing the counter clutch to rotate in the first direction, and translation of the drive channel in a second direction relative to the counter mechanism would cause the clutch pin to be cammed by the angled slot thereof thereby causing the counter clutch to rotate in the second direction.

The counter mechanism may include a latch member operatively engaged with the counter dial. In use, the latch member permits rotation of the counter dial in the first direction and inhibits rotation of the counter mechanism in a direction opposite to the first direction.

The counter mechanism may include a counter dial defining a lock out groove formed in an outer perimetrical edge thereof; and a lock out supported in the housing. The lock out may be biased such that a first catch thereof engages against the outer perimetrical edge of the counter dial. In use, as the counter dial is rotated and the lock out groove of the counter dial is brought into registration with the first catch of the lock out, the first catch of the lock out is urged into the lock out groove thereby preventing a rotation of the counter dial in an opposite direction.

The lock out may include a second catch. In use, the second catch of the lock out moves into a path of a translating member of the clip applier when the first catch of the lock out is moved into the lock out groove of the counter dial, thereby inhibiting a translation of the translating member of the clip applier.

The lock out groove of the counter dial may move into registration with the first catch of the lock out when a final clip of the plurality of clips has been fired. The lock out groove of the counter dial may be associated with an indicia on the counter mechanism indicating that the final clip has been fired. The indicia on the counter mechanism, indicating that the final clip of the plurality of clip has been fired, may be represented by the number “zero.”

The clip applier may further include a ratchet mechanism having a ratchet pawl pivotably supported in the housing; and a rack member provided on the translating member. The rack member may be in operative registration with the ratchet pawl. In use, the rack member translates across the ratchet pawl as the translating member translates. The ratchet mechanism may be prevented from re-setting when the rack member has not completed a fully translation.

BRIEF DESCRIPTION OF THE DRAWINGS

The present clip applier will be more fully appreciated as the same becomes better understood from the following detailed description when considered in connection with the following drawings, in which:

FIG. 1 is a perspective view of a surgical clip applier according to an embodiment of the present disclosure;

FIG. 2 is a top, plan view of the surgical clip applier of FIG. 1;

FIG. 3 is an enlarged view of the indicated area of detail of FIG. 2;

FIG. 4 is a perspective view of a mechanical counter assembly of the surgical clip applier of FIGS. 1 and 2;

FIG. 5 is an exploded perspective view of the surgical clip applier of FIGS. 1-4;

FIG. 6 is a perspective view of a handle assembly with a housing half-section removed therefrom and illustrating a counter of the mechanical counter assembly engaged with a drive channel;

FIG. 7 is a perspective view of a handle assembly with a housing half-section and drive channel removed therefrom and illustrating the counter of the mechanical counter assembly engaged with a ratchet;

FIG. 8 is an enlarged view of the indicated area of detail of FIG. 7;

FIG. 9 is a perspective view of a handle assembly with a housing half-section, the drive channel, and the ratchet removed therefrom;

FIG. 10 is a front, perspective view, with parts separated, of a counter and a clutch of the mechanical counter assembly;

FIG. 11 is a rear, perspective view, with parts separated, of the counter and the clutch of the mechanical counter assembly of FIG. 10;

FIG. 12 is a rear, perspective view of the counter and the clutch of the mechanical counter assembly of FIGS. 10 and 11;

FIG. 13 is a perspective view of a lock-out of the clip applier of FIGS. 1-4;

FIG. 14 is a top plan, schematic illustration of the mechanical counter assembly operatively connected to the drive channel when the clip applier is in an original unactuated position;

FIG. 14A is a side view of the mechanical counter assembly as viewed along 14A-14A of FIG. 14;

FIG. 14B is an enlarged view of the indicated area of detail of FIG. 14;

FIG. 14C is a cross-sectional view of the mechanical counter assembly as taken along 14C-14C of FIG. 14A;

FIG. 15 is a top plan, schematic illustration of the mechanical counter assembly operatively connected to the drive channel when the clip applier is initially actuated;

FIG. 15A is an enlarged view of the indicated area of detail of FIG. 15;

FIG. 15B is a cross-sectional view of the mechanical counter assembly as taken along 14C-14C of FIG. 14A, during the initial actuation of the clip applier;

FIG. 16 is a top plan, schematic illustration of the mechanical counter assembly operatively connected to the drive channel when the clip applier is fully actuated;

FIG. 16A is an enlarged view of the indicated area of detail of FIG. 16;

FIG. 16B is a cross-sectional view of the mechanical counter assembly as taken along 14C-14C of FIG. 14A, following the full actuation of the clip applier;

FIG. 17 is a top plan, schematic illustration of the mechanical counter assembly operatively connected to the drive channel when the clip applier is released after full actuation;

FIG. 17A is an enlarged view of the indicated area of detail of FIG. 17;

FIG. 17B is a cross-sectional view of the mechanical counter assembly as taken along 14C-14C of FIG. 14A, during a release of the clip applier following full actuation;

FIG. 18 is a cross-sectional view of the mechanical counter assembly as taken along 14C-14C of FIG. 14A, illustrating the mechanical counter assembly fully re-set;

FIG. 19 is a top, plan view of the mechanical counter assembly, illustrating the counter at a “zero” position and locked out;

FIG. 19A is a cross-sectional view of the mechanical counter assembly as taken along 14C-14C of FIG. 14A, illustrating the counter at a “zero” position and locked out; and

FIG. 19B is an enlarged view of the indicated area of detail of FIG. 19A.

DETAILED DESCRIPTION OF EMBODIMENTS

Embodiments of surgical clip appliers in accordance with the present disclosure will now be described in detail with reference to the drawing figures wherein like reference numerals identify similar or identical structural elements. As shown in the drawings and described throughout the following description, as is traditional when referring to relative positioning on a surgical instrument, the term “proximal” refers to the end of the apparatus which is closer to the user and the term “distal” refers to the end of the apparatus which is further away from the user.

Referring now to FIGS. 1-5, a surgical clip applier in accordance with an embodiment of the present disclosure is generally designated as 100. Surgical clip applier 100 generally includes a handle assembly 102 including a housing 104 having an upper housing half 104 a and lower housing half 104 b. Handle assembly 102 further includes a pair of handles 106 pivotably secured to housing 104 and extending outwardly therefrom. A channel assembly 108 is fixedly secured to housing 104 and extends outwardly therefrom, terminating in a jaw assembly 110.

As seen in FIGS. 1-5, housing halves 104 a and 104 b of clip applier 100 fit together by snap fit engagement with one another. Housing 104 defines a window 104 c formed in lower housing half 104 b for supporting and displaying a counter mechanism, as will be discussed in greater detail below.

As seen in FIG. 4, handles 106 are secured to housing 104 by handle pivot posts 104 d extending from lower housing half 104 b and into respective apertures 106 a formed in handles 106. Handle assembly 102 includes a link member 122 pivotally connected to each handle 106 at a pivot point 106 b formed in a respective handle 106. A distal end of each link member 122 is pivotally connected to a pivot point formed in a drive channel 140 via a drive pin 124. Each end of drive pin 124 is slidably received in an elongate channel formed in a respective upper and lower housing half 104 a, 104 b. In use, as will be described in greater detail below, as handles 106 are squeezed, link members 122 push drive channel 140 distally via drive pin 124.

Channel assembly 108 includes a channel or cartridge cover 130 and an outer or lower channel 132 each having a proximal end retained in housing assembly 102, between upper and lower housing halves 104 a, 104 b.

As seen in FIG. 5, clip applier 100 includes a clip pusher bar 160 slidably disposed beneath cartridge cover 130, a stabilizer 162 configured to overlie and engage pusher bar 160, a motion multiplier system 155 supported in housing 104, a clip carrier 170 disposed within channel assembly 108 and beneath pusher bar 160, a stack of surgical clips “C” loaded and/or retained within clip carrier 170 in a manner so as to slide therewithin and/or therealong, a clip follower 174 slidably disposed within clip carrier 170 and positioned behind the stack of surgical clips “C,” a wedge plate 180 slidably disposed within handle assembly 102 and channel assembly 108, a wedge plate pivot arm 179 pivotally supported in lower housing half 104 b of housing 104 for transmitting translation of drive channel 140 to translation of wedge plate 180, a drive channel 140 reciprocally supported in and extending between housing 104 of handle assembly 102 and channel assembly 108, an audible/tactile indicator 148 connected to drive channel 140 via drive pin 124, and a jaw assembly 110 mounted on or at a distal end of channel assembly 108 and actuatable by handles 106 of handle assembly 102.

Reference may be made to U.S. Provisional Application No. 61/091,467, filed on Aug. 25, 2008, entitled “Surgical Clip Applier” and U.S. Provisional Application No. 61/091,485, filed on Aug. 25, 2008, entitled “Surgical Clip Applier and Method of Assembly,” the entire contents of each of which being incorporated herein by reference, for a detailed discussion of the structure, operation, and method of assembly of various components surgical clip applier 100. Reference may also be made to U.S. Provisional Application No. 61/286,569, filed on Dec. 15, 2009, entitled “Surgical Clip Applier”, the entire contents of which is incorporated herein by reference, for additional detailed discussion of the structure, operation, and method of assembly of various components of surgical clip applier 100.

As seen in FIGS. 1-12, clip applier 100 further includes a mechanical counter mechanism 190 supported in housing 104 of handle assembly 102. Counter mechanism 190 includes a counter dial 192 rotatably disposed within housing 104 so as to overlie window 104 c formed in lower housing half 104 b, a counter clutch 194 operatively connected to counter dial 192 and configured to permit uni-directional rotation of counter dial 192, and a latch member 196 configured to engage counter dial 192.

As seen in FIGS. 4-11, counter dial 192 includes a first face 192 a disposed adjacent window 104 c formed in lower housing half 104 b. First face 192 a includes a plurality of indicia 192 b, in the form of sequential numbers disposed thereof and substantially around a radial periphery thereof. Indicia 192 b may correspond to the number of clips that are loaded in clip applier 100. By way of example only, indicia 192 b may be numerals from “0-22.” Indicia 192 b are located on first face 192 a so as to be in registration with window 104 c formed in lower housing half 104 b. Counter dial 192 includes a second face 192 c, opposite first face 192 b, and defining a bore 192 d therein. Bore 192 d includes a radial array of uni-directional teeth 192 e formed therein. Counter dial 192 further includes a first or outer rim defining a plurality of grooves 192 f formed around an outer periphery thereof, and a second or inner rim defining a single groove 192 g formed in an outer periphery thereof.

With continued reference to FIGS. 4-11, counter clutch 194 is concentrically and rotatably nested in bore 192 d of counter dial 192. Counter clutch 194 of mechanical counter mechanism 190 includes a body portion 194 a configured and dimensioned for rotatable disposition in bore 192 d of counter dial 192. Counter clutch 194 includes a pair of opposed resilient fingers 194 b, 194 c extending substantially tangentially from body portion 194 a. Resilient fingers 194 b, 194 c extend from body portion 194 a by an amount sufficient so as to resiliently engage uni-directional teeth 192 e of dial 192. Counter clutch 194 includes a clutch pin 194 d extending from body portion 194 a and projecting out of bore 192 d of counter dial 192.

As seen in FIGS. 4-9, latch member 196 of mechanical counter mechanism 190 is secured to lower housing half 104 b. Latch member 196 includes a resilient finger 196 a configured to contact and selectively engage grooves 192 f formed around the outer periphery of counter dial 192.

As seen in FIGS. 5 and 6, drive channel 140 defines an angled slot 140 a formed therein at a location so as to slidably receive clutch pin 194 d extending from body portion 194 a of counter clutch 194. Angled slot 140 a of drive channel 140 extends in a direction away from a longitudinal axis of clip applier 100 from a proximal to a distal direction.

As seen in FIGS. 4, 5, 7 and 8, clip applier 100 includes a ratchet rack member 141 slidably disposed in lower housing half 104 b. Rack member 141 is pinned to drive pin 124 such that translation of drive pin 124 relative to housing 104 results in concomitant translation of rack member 141. Rack member 141 is disposed in housing 104 such that clutch pin 194 d of counter clutch 194 rides along or contacts a side edge 141 b thereof. Rack member 141 includes ratchet teeth 141 a formed along an edge thereof and are configured and adapted to engage with a ratchet pawl 142 supported in housing 104. Rack member 141 and pawl 142 define a ratchet mechanism 144.

In use, as drive channel 140 is moved axially by drive pin 124, rack member 141 is also moved. Rack teeth 141 a of rack member 141 has a length which allows pawl 142 to reverse and advance back over rack member 141 when rack member 141 changes between proximal and distal movement as drive channel 140 reaches a proximal-most or distal-most position.

Pawl 142 is pivotally connected to lower housing half 104 b by a pawl pin at a location wherein pawl 142 is in substantial operative engagement with rack member 141. Pawl 142 is engageable with rack member 141 to restrict longitudinal movement of rack member 141 and, in turn, drive channel 140. Ratchet mechanism 144 further includes a pawl spring 145 configured and positioned to bias pawl 142 into operative association with rack member 141. Pawl spring 145 functions to maintain the teeth of pawl 142 in engagement with the teeth 141 a of rack member 141, as well as to maintain pawl 142 in a rotated or canted position.

As seen in FIGS. 4, 5, 7-9 and 13, clip applier 100 further includes a lock out 146 pivotally connected or supported in housing 104. Lock out 146 includes a body portion 146 a, a first catch 146 b formed at one and of body portion 146 a, and a second catch 146 c extending from a side edge of body portion 146 a. First catch 146 b is configured and dimensioned to engage groove 192 g formed in the outer periphery of the inner rim of counter dial 192. Second catch 146 c is configured and dimensioned to engage a notch 141 c formed in a side edge of rack member 141. A biasing member 147 is provided to maintain first catch 146 b of lock out 146 in contact with the outer periphery of the inner rim of counter dial 192.

Turning now to FIGS. 14-19B, the operation of clip applier 100 is provided. Prior to any initial squeezing of handles 106 of clip applier 100 and with clip applier 100 fully loaded with clips “C,” as seen in FIGS. 14-14C, drive channel 140 is located at a proximal-most position, indicia 192 b of counter dial 192 of mechanical counter mechanism 190, relating to a fully loaded clip applier 100, in the present instance being fully loaded with twenty-two (22) clips, is visible through window 104 c formed in housing half 104 b. Accordingly, as seen in FIG. 14B, the numeral “22” is visible through window 104 c. Also, as seen in FIG. 14B, resilient finger 196 a of latch member 196 is engaged in a groove 192 f formed around the outer periphery of counter dial 192.

As seen in FIG. 14C, prior to any squeezing of handles 106, clutch pin 194 d of counter clutch 194 is disposed at a distal end of angled slot 140 a of drive channel 140. Also, first catch 146 b of lock out 146 is in contact with the outer periphery of the inner rim of counter dial 192 so that second catch 146 c of lock out 146 is disengaged from rack member 141. Moreover, prior to any squeezing of handles 106, and when clip applier 100 is fully loaded with clips, groove 192 g formed in the outer periphery of the inner rim of counter dial 192 is oriented distal of first catch 146 b of lock out 146.

As seen in FIGS. 15-15B, during an initial squeeze of handles 106, as indicated by arrow “A1,” drive pin 124 translates drive channel 140 and rack member 141 in a distal direction, as indicated by arrow “B1.” As drive channel 140 is translated in a distal direction, angled slot 140 a of drive channel 140 is moved in a distal direction relative to clutch pin 194 d of counter clutch 194, clutch pin 194 d is cammed through angled slot 140 a of drive channel 140 causing counter clutch 194 to rotate in the direction of arrow “C1.” As counter clutch 194 is rotated in the direction of arrow “C1,” as seen in FIG. 15B, resilient fingers 194 b, 194 c thereof engage uni-directional teeth 192 e of dial 192, thereby causing dial 192 to also rotate in the direction of arrow “C1.” Moreover, as dial 192 is rotated in the direction of arrow “C1,” groove 192 g formed in the outer periphery of the inner rim of counter dial 192 is rotated away from first catch 146 b of lock out 146 as first catch 146 b continues to ride along the outer periphery of the inner rim of counter dial 192.

As dial 192 is rotated in the direction of arrow “C1,” as seen in FIG. 15A, indicia 192 b of numeral “22” is moved relative to window 104 c formed in housing half 104 b, thereby beginning to decrement. Additionally, as dial 192 is rotated in the direction of arrow “C1,” resilient finger 196 a of latch member 196 begins to disengage the groove 192 f formed around the outer periphery of counter dial 192.

As seen in FIGS. 16-16B, during a final or complete squeeze of handles 106, as indicated by arrow “A1,” drive pin 124 further translates drive channel 140 and rack member 141 in a distal direction, as indicated by arrow “B1.” As drive channel 140 is further translated in a distal direction, angled slot 140 a of drive channel 140 is further moved in a distal direction relative to clutch pin 194 d of counter clutch 194, clutch pin 194 d is further cammed through angled slot 140 a of drive channel 140 causing counter clutch 194 to further rotate in the direction of arrow “C1.” As counter clutch 194 is further rotated in the direction of arrow “C1,” as seen in FIG. 16B, resilient fingers 194 b, 194 c continue to cause dial 192 to rotate in the direction of arrow “C1.” Moreover, as dial 192 is further rotated in the direction of arrow “C1,” groove 192 g formed in the outer periphery of the inner rim of counter dial 192 is further rotated away from first catch 146 b of lock out 146 as first catch 146 b further continues to ride along the outer periphery of the inner rim of counter dial 192.

As dial 192 is further rotated in the direction of arrow “C1,” as seen in FIG. 16A, indicia 192 b of numeral “22” is completely moved out of view of window 104 c formed in housing half 104 b and new numeral “21” is moved into view of window 104 c, thereby fully being decremented. This change of numeral, or decrementing, coinciding with a formation and/or firing/ejection/release of a clip from clip applier 100. In this manner, the user is shown the number of clips remaining in clip applier 100 and available to fire. Additionally, as dial 192 is further rotated in the direction of arrow “C1,” resilient finger 196 a of latch member 196 moves into engagement in a groove 192 f′ adjacent to groove 192 f formed around the outer periphery of counter dial 192.

Turning now to FIGS. 17-18, during an opening of handles 106, as indicated by arrow “A2,” drive pin 124 translates drive channel 140 and rack member 141 in a proximal direction, as indicated by arrow “B2.” As drive channel 140 is translated in a proximal direction, angled slot 140 a of drive channel 140 is moved in a proximal direction relative to clutch pin 194 d of counter clutch 194, clutch pin 194 d is cammed through angled slot 140 a of drive channel 140 causing counter clutch 194 to rotate in the direction of arrow “C2,” opposite to “C1.” As counter clutch 194 is rotated in the direction of arrow “C2,” as seen in FIG. 17B, resilient fingers 194 b, 194 c are caused to deflect and snap over uni-directional teeth 192 e of dial 192. as seen from FIG. 17A, any frictional forces tending to cause dial 192 to also rotate in the direction of arrow “C2” and negated by the engagement of resilient finger 196 a of latch member 196 in groove 192 f formed around the outer periphery of counter dial 192, thereby maintaining the rotational orientation of dial 192.

With dial 192 being held or maintained in this rotational orientation, indicia 192 b of numeral “21” is maintained in view in window 104 c.

As seen in FIG. 18, when drive channel 140 has been moved back to the fully proximal position, resilient fingers 194 b, 194 c of counter clutch 194 are re-set in engagement with adjacent uni-directional teeth 192 e of dial 192.

Additionally, as dial 192 is further rotated in the direction of arrow “C1,” resilient finger 196 a of latch member 196 moves into engagement in a groove 192 f adjacent to groove 192 f formed around the outer periphery of counter dial 192.

Turning now to FIGS. 19-19B, during the squeezing of handles 106, upon the firing of a final clip loaded in clip applier 100, indicia 192 b of dial in the form of numeral “0” is completely moved into view of window 104 c formed in housing half 104 b, thereby indicating to the user that no more clip are present in clip applier 100. When dial 192 has been rotated to this position, as seen in FIGS. 19A and 19B, groove 192 g formed in the outer periphery of the inner rim of counter dial 192 is rotated into registration with first catch 146 b of lock out 146. In this position, biasing member 147, acting on lock out 146, urges first catch 146 b of lock out 146 into groove 192 g of dial 192.

Additionally, in the present position, second catch 146 c of lock out 146 is moved into notch 141 c formed in the side edge of rack member 141 and thus into the path of proximal translation of rack member 141. Accordingly, as handles 106 are released and drive pin 124 begins to move rack member 141 in a proximal direction, notch 141 c of rack member 141 engages second catch 146 c of lock out 146 thereby prohibiting rack member 141 from returning to a proximal most or home position. With rack member 141 being inhibited or blocked from returning to the proximal most position, ratchet pawl 142 of ratchet mechanism 144 (see FIG. 5) is prevented from resetting itself. Since pawl 142 is prevented from resetting itself, handles 106 can not be re-actuated or re-squeezed since they have only been partially opened. Once again, reference may be made to U.S. Provisional Application No. 61/091,467, filed on Aug. 25, 2008 (now U.S. Pat. No. 8,465,502), entitled “Surgical Clip Applier;” U.S. Provisional Application No. 61/091,485, filed on Aug. 25, 2008 (now U.S. Pat. No. 8,056,565), entitled “Surgical Clip Applier and Method of Assembly;” and U.S. Provisional Application No. 61/286,569, filed on Dec. 15, 2009 (now U.S. Pat. No. 8,545,486), entitled “Surgical Clip Applier”, for a detailed discussion of the structure, operation, and method of assembly of various components of surgical clip applier 100.

It should be understood that the foregoing description is only illustrative of the present disclosure. Various alternatives and modifications can be devised by those skilled in the art without departing from the disclosure. Accordingly, the present disclosure is intended to embrace all such alternatives, modifications and variances. The embodiments described with reference to the attached drawing figures are presented only to demonstrate certain examples of the disclosure. Other elements, steps, methods and techniques that are insubstantially different from those described above and/or in the appended claims are also intended to be within the scope of the disclosure. 

What is claimed is:
 1. A surgical clip applier, comprising: a housing; a drive channel supported in the housing; and a counter mechanism supported in the housing and including: a counter dial rotatably supported in the housing, the counter dial including teeth, a first rim defining a plurality of grooves formed around an outer periphery thereof, and a second rim defining a lock out groove formed in an outer periphery thereof; a counter clutch operatively coupled to the drive channel, the counter clutch including at least one finger configured to engage at least one tooth of the teeth of the counter dial to rotate the counter dial in a single direction relative to the drive channel; a ratchet mechanism including a rack member and a ratchet pawl, the rack member translatably supported in the housing, operatively coupled to the drive channel, and including a plurality of ratchet teeth, the ratchet pawl supported in the housing and configured to engage the plurality of ratchet teeth to restrict translation of the rack member relative to the housing; and a latch member configured to selectively engage the counter dial, wherein the latch member permits rotation of the counter dial in the first direction relative to the drive channel and inhibits rotation of the counter mechanism in the second direction relative to the drive channel, wherein the latch member is configured to contact and selectively engage the plurality of grooves formed on the outer periphery of the first rim of the counter dial; wherein when the drive channel is translated in a first direction relative to the housing, the counter clutch is configured to rotate in a first direction relative to the drive channel such that the at least one finger of the counter clutch engages at least one tooth of the teeth of the counter dial to rotate the counter dial in the first direction relative to the drive channel, and wherein when the drive channel is translated in a second direction relative to the housing, the counter clutch is configured to rotate in a second direction relative to the drive channel such that the at least one finger of the counter clutch disengages from the teeth of the counter dial and the counter dial is not rotated in the second direction relative to the drive channel.
 2. The surgical clip applier according to claim 1, further comprising a clip carrier, and a plurality of clips loaded in the clip carrier.
 3. The surgical clip applier according to claim 1, wherein the rack member includes a first edge and an opposing second edge, the first edge defining the plurality of ratchet teeth and the second edge defining a notch.
 4. The surgical clip applier according to claim 3, further including: a lock out member supported in the housing, the lock out member having a body portion defining a first catch and a second catch, the first catch configured to engage the lock out groove formed in the second rim of the counter dial and the second catch configured to engage the notch defined on the second edge of the rack member.
 5. The surgical clip applier according to claim 4, further including: a lock out spring resiliently biased to maintain the first catch of the lock out member in contact with the outer periphery of the second rim of the counter dial, wherein as the counter dial is rotated in the first direction relative to the drive channel, the first catch of the lock out member is brought into registration with the lock out groove when a final clip of a plurality of clips has been fired to inhibit further rotation of the counter dial in the first direction relative to the drive channel.
 6. The surgical clip applier according to claim 5, wherein when the final clip of the plurality of clips has been fired and the first catch of the lock out member is brought into registration with the lock out groove, the second catch of the lock out member is brought into registration with the notch defined on the second edge of the rack member such that the rack member is prevented from translating relative to the housing.
 7. The surgical clip applier according to claim 6, further including at least one handle pivotably connected to the housing, wherein actuation of the at least one handle is configured to translate the drive channel, wherein when the second catch of the lock out member is brought into registration with the notch defined on the second edge of the rack member, the at least one handle is prevented from actuation.
 8. The surgical clip applier according to claim 7, wherein the lock out groove of the counter dial is associated with indicia on the counter dial indicating that the final clip of the plurality of clips has been fired.
 9. A counter mechanism for use with a surgical instrument, the counter mechanism comprising: a counter dial including teeth; a counter clutch including at least one finger configured to engage at least one tooth of the teeth of the counter dial to rotate the counter dial in a single direction; a ratchet mechanism including a rack member and a ratchet pawl, the rack member including a plurality of ratchet teeth, the ratchet pawl configured to engage the plurality of ratchet teeth to restrict translation of the rack member wherein when a drive channel of the surgical instrument is translated in a first direction, the counter clutch is configured to rotate in a first direction such that the at least one finger of the counter clutch engages at least one tooth of the teeth of the counter dial to rotate the counter dial in the first direction, and wherein when the drive channel is translated in a second direction, the counter clutch is configured to rotate in a second direction such that the at least one finger of the counter clutch disengages from the teeth of the counter dial and the counter dial is not rotated in the second direction; and a lock out member configured to maintain contact with the counter dial as the counter dial rotates in the first direction to urge a portion of the lock out member into engagement with a portion of the counter dial to inhibit translation of the drive channel.
 10. The counter mechanism according to claim 9, wherein the counter dial includes a first face and an opposing second face, the first face including indicia and the second face defining a bore therein, wherein the teeth of the counter dial are located within a perimetrical array in the bore.
 11. The counter mechanism according to claim 10, wherein the counter clutch is nested in the bore defined in second face of the counter dial.
 12. The counter mechanism according to claim 9, wherein when a final clip of a plurality of clips within the surgical instrument is fired, the lock out member is configured to engage the counter dial to inhibit further rotation of the counter dial in the first direction.
 13. A surgical clip applier, comprising: a housing; a drive channel supported in the housing; and a counter mechanism supported in the housing and including: a counter dial rotatably supported in the housing, the counter dial including teeth, a first rim defining a plurality of grooves formed around an outer periphery thereof, and a second rim defining a lock out groove formed in an outer periphery thereof; a counter clutch operatively coupled to the drive channel, the counter clutch including at least one finger configured to engage at least one tooth of the teeth of the counter dial to rotate the counter dial in a single direction relative to the drive channel; and a ratchet mechanism including a rack member and a ratchet pawl, the rack member translatably supported in the housing, operatively coupled to the drive channel, and including a plurality of ratchet teeth, the ratchet pawl supported in the housing and configured to engage the plurality of ratchet teeth to restrict translation of the rack member relative to the housing; wherein when the drive channel is translated in a first direction relative to the housing, the counter clutch is configured to rotate in a first direction relative to the drive channel such that the at least one finger of the counter clutch engages at least one tooth of the teeth of the counter dial to rotate the counter dial in the first direction relative to the drive channel, and wherein when the drive channel is translated in a second direction relative to the housing, the counter clutch is configured to rotate in a second direction relative to the drive channel such that the at least one finger of the counter clutch disengages from the teeth of the counter dial and the counter dial is not rotated in the second direction relative to the drive channel. 